import time

sleep_interval=1
thistime=0
lasttime=0
times=0
while True:
	thistime=time.time()
	cr=float(thistime-lasttime)
	print cr
	if cr != 1:
		pass
		#print thistime
		#print lasttime
		#print cr
		#print times
	time.sleep(sleep_interval)
	times=times+1
	lasttime=thistime
